Connected: An Internet Encyclopedia
RFC 1122 - 4.2.2.7 TCP Checksum: RFC-793 Section 3.1

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### 4.2.2.7 TCP Checksum: RFC-793 Section 3.1

Unlike the UDP checksum (see Section 4.1.3.4), the TCP checksum is never optional. The sender MUST generate it and the receiver MUST check it.

Next: 4.2.2.8 TCP Connection State Diagram: RFC-793 Section 3.2, page 23

Connected: An Internet Encyclopedia
RFC 1122 - 4.2.2.7 TCP Checksum: RFC-793 Section 3.1